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John Orlando john at epiq-solutions.comOn Sun, Jan 30, 2011 at 11:20 AM, Bogdan Alecu <b.alecu at yahoo.com> wrote: > Hi Mad, > Thanks for explaining me this. The case of the TMSI is different from > network to network: some operators change it for every x minutes, others > after a powercycle (at least here). You say that gsm tries to avoid sending > out IMSIs but still some are sent. If I would send an SMS to the phone - so > it will get a paging request - I should see the IMSI also in that list? > If you send an SMS to the phone, the "typical scenario" would be: -Network pages the mobile, most likely with its TMSI (as stated before) -Mobile will send a RACH to request a dedicated channel -Network will assign the mobile to a dedicated channel (typically a SDCCH) -Network will perform contention resolution on the dedicated channel to ensure that it is the correct mobile (to cover the rare case where two mobiles RACH at the exact same time) -Network may or may not begin ciphering at this point -Network will deliver the SMS payload to the mobile through a series of messages on the dedicated channel -Mobile will ack each message, letting the network know that it has received what was sent -Network will release the dedicated channel, the mobile will go back to its idle mode (monitoring the paging channels etc), and the mobile will then have the SMS It is up to the network to decide what ID type it wants to use to page a mobile, and this is dependent on a number of factors. Almost always it uses the TMSI, sometimes IMSI, and _very_ rarely an IMEI. It is certainly possible that the network can also request identity info (IMSI, IMEI) from the mobile on the dedicated channel, as well as a whole host of other message requests while on the dedicated channel. So in short, unless you're lucky enough to have the network page you with your IMSI, it is unlikely you will see it. -- John Orlando CEO/System Architect Epiq Solutions www.epiq-solutions.com -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/baseband-devel/attachments/20110130/c75bf532/attachment.htm>